Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Lubricating oil composition

Inactive Publication Date: 2005-02-03
NIPPON OIL CORP +1
View PDF13 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is intended to respond to the above request, and the object of the present invention is to provide a lubric

Problems solved by technology

A larger size of a clutch and a higher number of clutches result in a larger size of an automatic transmission itself comprising the clutches, and an increased hydraulic pressure for pressing leads to an excessive load upon the oil hydraulic pump

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lubricating oil composition
  • Lubricating oil composition
  • Lubricating oil composition

Examples

Experimental program
Comparison scheme
Effect test

Example

A lubricating oil composition according to the present invention (Example 1) and lubricating oil compositions for comparison (Comparative examples 1 to 5) were prepared through compounding various lubricant base oils and additives given in Table 1. The amounts of the respective additives were on the basis of the total amount of the lubricating oil composition.

The fatigue life of each of the resultant compositions was evaluated by a friction properties test for a wet clutch described in the following (1). The results of the evaluation for the respective compositions are together described in Table 1.

(1) The Friction Properties Test for a Wet Clutch

The friction properties test for a wet clutch was conducted in accordance with JASO M348-95 “Test method for friction property of automatic transmission fluids” using an SAE No. 2 friction tester. This test is consisted of a dynamic friction test and a static friction test. In the dynamic friction test, after a clutch was rotated at ...

Example

Whereas, (A) a lubricating oil composition which contains no polyol compounds (Comparative example 1), (B) a lubricating oil composition which contains no alkali metal borate (Comparative example 2), (C) a lubricating oil composition which contains an ashless dispersant in an amount less than that defined by the present invention (Comparative example 3) and (D) a lubricant composition which contains no specified alkaline earth sulfonate (Comparative examples 4 and 5) showed all a dynamic friction coefficient of approximately 0.15, which indicates that the dynamic friction coefficient is enhanced by a synergistic effect of components (A)-(D) in the composition of the example 1 of the present invention. Further, the static friction coefficients in the case of the lubricating oil compositions of Comparative examples 3-5 were all significantly lower.

EFFECT OF THE INVENTION

The lubricating oil composition, which has the above described constitution, is excellent in the effect of enhan...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Percent by massaaaaaaaaaa
Percent by massaaaaaaaaaa
Percent by massaaaaaaaaaa
Login to View More

Abstract

A lubricating oil composition which comprises a lubricant base oil and, incorporated therein, (A) from 0.01 to 0.2 mass % of a polyol compound having from 2 to 20 carbon atoms, (B) from 0.03 to 0.05 mass %, in terms of the amount of boron, of an alkali metal borate, (C) from 0.05 to 0.2 mass %, in terms of the amount of nitrogen, of an ashless dispersant, and (D) from 0.1 to 0.4 mass %, in terms of the amount of an alkaline earth metal, of an alkaline earth metal sulfonate having a total base number of 250 mg-KOH/g or more, the percentages being based on the total amount of the composition. The lubricating oil composition can simultaneously enhance the dynamic and the static friction coefficients in a wet clutch, and is suitable for use particularly in an automatic transmission.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil composition, in particular, to a lubricating oil composition which is capable of combining the enhancement of the dynamic friction in a wet clutch and the enhancement of the static friction in the wet clutch, and is suitable for use particularly in an automatic transmission. 2. Description of the Prior Art Nowadays, the improvement of the fuel efficiency of an automobile has become an urgent task for the purpose of reducing the amount of the carbon dioxide discharged, in the context of global environment problems. Accordingly, the contribution to the improvement of the fuel efficiency of an automobile is clearly required not only the improvement by the reduction of the friction in an engine, but also the improvement of an automatic transmission. An automatic transmission is composed of a torque converter, a wet clutch, a gear-bearing mechanism and a hydraulic control mechani...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C10M101/02C10M105/04C10M105/36C10M105/38C10M125/26C10M129/08C10M133/56C10M139/00C10M159/24C10M163/00C10M169/04C10N10/02C10N10/04C10N30/06C10N40/04C10N60/14
CPCC10M163/00C10N2260/14C10M169/048C10M2201/087C10M2203/1025C10M2207/022C10M2209/084C10M2215/064C10M2215/086C10M2215/28C10M2219/046C10M2229/041C10N2210/02C10N2230/06C10N2230/54C10N2240/042C10M169/045C10N2010/04C10N2030/06C10N2060/14C10N2030/54C10N2040/042
Inventor KOMATSUBARA, HITOSHIMATSUI, SHIGEKIYAMANE, TOMONORIYOSHIDA, JUNPEI
Owner NIPPON OIL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com